On the jacket of his recent book on illiteracy, Kozol  writes, “One out of

 three adults in the United States lacks the ability to read this book.” 

 According to Kozol, this is equivalent to  60  million people.  Kozol then

 divides these into the 25 million reading at lower than a fifth-grade level

 or not able to read at all and the additional  35  million reading at levels

 from fifth through eighth grades.

 A If all of Kozol’s  claims as given are true, which of the following must also

 be true?

   B Kozol’s book is not substantially below the ninth-grade reading level. 

      Over   25  million adults in the United States have failed to enter the

        sixth grade. 

    C    Many adults who want to read Kozol’s book cannot do so. 

     D Illiteracy in the United States is not as pervasive as people

        commonly believe. 

    E    One out of three students who enter high school in the United States

        fails to graduate. 

答案A